pH measurement and control

To ensure the long-term
stability of nutrient solutions, it is important to maintain the pH
between 5.0 and 6.5. This helps ensure all nutrients are available for
root up-take. It also minimizes the risk of plumbing blockages.

What is pH?

pH measures the concentration of hydrogen ion
(H+) or acidity in a liquid. The pH values of most aqueous solutions, such
as drinking waters, have pH values of around 6 to 8. The more acidic the
water the lower the pH. Conversely, the more alkaline the solution the
higher the pH.

The pH scale is logarithmic, which means that
each 1 unit variation in pH represents a 10 fold change in the hydrogen
ion concentration. For example, water with a pH of 4.0 is 100 times more
acidic than one of pH 6.0.